I took a trip during the summer of 2010 in my then sDrive Z4 35i 2009 and my average fuel consumption was around 8.5 to 9.5 L/100 KM. That was my average for the cross country trip and back home (Toronto - LA and back home to Toronto)

Here I was just after stopping on Route 66 to look at the biggest chair I ever saw

BTW. Fuel consumption should not be a concern when driving this kind of car, I keep an eye on it mainly to keep an eye on the engine healt and my driving style

I think I saw > 30 mpg (for a short period of time) while driving on the highway, using the cruise control. I only had it on for a short period of time, though. Too much fun engaging in the drive (with the Z4 anyway) and accelerating / breaking myself.

Do all of you guys base your findings with the fuel consumption from the car display? I find the display to give out consistently higher returns when comparing to my phone app, usually by 1km/L (2.35MPG), which is a whole 10% off. Anyone else log their trips and fill ups with an app?

Do all of you guys base your findings with the fuel consumption from the car display? I find the display to give out consistently higher returns when comparing to my phone app, usually by 1km/L (2.35MPG), which is a whole 10% off. Anyone else log their trips and fill ups with an app?

I don't get it. It's simply miles divided by gallons. How can you get a false reading?
Anyway, What's important is to identify significant changes in mpg between fill ups, not necessarily what method you're assessing it with.

Read about the significantly higher MPGs compared to EPA on the forum before getting the car... after 1,500 miles and I only got over 19 MPG once.. just long enough for it to quickly drop back down to 18s. I don't think I have an extremely hard foot either, hmm. Maybe still needs to break in?